Indicating micrometer



am. 1s, 1927. P" s ARNOLD .111111011111111 MIGRMETER Filed May 151. 1920 1l 1 l Nul 5 sheets-sheet 1 y 1,615,060 18 1927 P. s. ARNOLD INDICATING MICROMETR Filed may 15. 192:0v s sheets-sheet z Jah.

n im Aug ttoz nag Jan. 1a, 1927. 1,615,060

P. s. ARNOLD INDICATLNG MIGROMETER Filed May 15. 1920 3 Sheets-Sheet 5 /fff l@RomanaA P afeta Jaa. 1s, 1927.

UNITEDv STATES `PATENT OFFICE.

PHILII s. ARNoLD, or DETROIT, MICHIGAN, AssIGNoR or ONE-FIFTH To CHARLES D.

. wIsNER, on DETROIT, MICHIGAN.

INDICATING MICROMETER.

Application led May 15,

This invention relates to indicating micrometers, and its object is to provide a micrometer or caliper for use in conjunction with grinding machines in .grinding cylindrical objects of a construction and character to indicate when the object operated upon has been ground to the desired size. Heretofore, in grinding various articles, as for instance, ya shaft, it is necessary for the operator to caliper the object being ground several times during the grinding operation to determihe when theV article has been ground to size and with some types of calipering operation, the grinding operation has to be stopped to permit` of the calipering of the work. Also with snap gauges which are sometimes used or this purpose capable of being placed on he article during the grinding thereof the .caliper points bind on the article and the gauge is forcibly drawn from the operators hand and destroyed. The caliper points of `a snap gauge soon wear and such gauges soon become inaccurate. To secure accuracy by use of such previous devices much time is consumed and necessitates the stopping of the machine during the-careful calipering of the work and considerable loss is occasioned through the article being finished slightly over or undersize.

This invention seeks to obviate these difficulties to eliminate the loss of time and to secure much greater accuracy in the grinding of an objectand this is secured through an arrangement of the parts having an indicator over which a pointer passes, the movement of the pointer being greatly magnified relative to the movement Aof the calipering shoes or points thus enabling much greater' accuracy to be secured both by reason of visible indication as to when the article is approaching the desired size and also by reason of the exaggerated movement of the pointer which makes the condition of the work plainly visible.

Another object of this invention is to pro- .vide an indicating micrometer of-the general I' character stated adapted to be mounted on framework of a grinding wheel provi-ded with calipering points or shoes' riding the` work during the grinding operation and providing in conjunction therewith an indicator visibly indicating the extent of move- 1920. Serial No. 381,543.

of the diameter of the work by the grinding wheel. Another object of the invention is to provide a micrometer of the character stated adapted to be adjusted for use upon work of various sizes and that further is of a construction permitting the calipering points or shoes to be separated for the removal of the finished work and introduction of new work therebetween, in the construction of the indicator and mechanism through which the indicator is operated and in the arrange- .ment of the parts permitting the shoes and the relationship ofthe grin-ding wheel to the l Calibrating device. Y.

Fig. 3 is a vertical section through thegindicator andV upper end of the shaft carrying one of the shoes.

Fig. 4 is a section taken on line 4- 4 of Fig. 1 showing the mounting of the pointer.

Fig. 5 is a plan view of the supporting bracket for-the gauge. i,

The device consists of a stationary frame member 1 which is somewhat U-shaped in form, the outer end thereof having a vertical aperture fora pin 2 and intermediate its ends is provided an aperture for the pin 3. The pins are provided onthe head 4 of a movable frame member 5 carrying a shoe Ior calipering point 6 and rod f? thereof. The opposite end of the stationary Vframe member llin which the pins 2 and 3 ride -is iiX- edly supported on a vertical supporting rod 8, the end of the' frame being-provided with an a erture for the said rod and also being provided with a set screw 9 by means of which the. frame member 1 may be adjusted in its vertical position on-the' rod. This rod at the upper end is secured to a bracket 10 in which the rod is clamped and which Thus the rodA 8 and the frame member 1 are held in lixed position and the construction provides for a vertical adjustment of' the frame 1 on t e rod and adjustment of the rod and lixed frame thereon in the bracket 10 thereby providing" adjustment for operation on work of various diameters. The lower end 13 "of the rod has an aperture therein in which rides a vertical rod 14, the diameter of which is somewhat less than the diameter of the aperture thereforin the por- .tion 13. This permits a considerable latitude of movement of the rod 14 relative to the rod 8. The rods 8 and 14 are practically in the same plane and are positioned at the rear of the movable frame 5 as will be understood fromFig. 2. The Vrod 14 at the bottom is a stationary part 95 and a movable part 96 connected therewith by means of a screw 97. These stationary and movable parts provide a clamp engaging over the base of the shoe. The structural features of the holder, how-Y ever, are not material to this invention but, by roviding means v ermitting of their rea be readily utilized and worn shoes easily removed and new ones inserted.

The head 4' of the movable frame 5 has an, inwardly extending portion 19 terminating with a split bearing 20 in whichf` is clamped the rod14. The rod 14 is thus ver ,tically adjustable in the clamp 20 and this j adjustment and the adjustments of the frame memberl and rod 8 in its bracket permits of the setting of t/he parts to operate on work of' various diameters as hereinbefore The rod 7 carrying the shoe 6 is reciproca ble in the frame 5 and about the rod in this tubular frame member 5 is a coiled compression spring which engages against the indicator block 26 attached to the frame member at the upper end and against ashoulder 27 formed on the rod as indicated by dotted lines in Fig. 1. This spring tends to force the Shoe 6 downward in contact with the work and, as this spring is carried in the frame 5 abutting against a fixed portion thereof which frame also carries the head 4 to which the shoe 18 is lixedly attached by means of the rod 14, the shoe 18 is therefore drawn` upward and the shoe 6 pressed down! Award into engagement with opposite -sides of the work by this one spring. -As the y removal, shoes o diferent sizes mayframe 5 and head 4 thereon float in the frame 1 there is plenty of latitude of move ment allowed to permit the two parts s'upporting the shoes to enable the same to ride the work and to be held in engagement therewith even though there be some slight variations'in the position relative to the xed frame part of the device. The rods 2 and 3 are simply guide rods for the movable.

frame and loosely lit the apertures in the frame 1 provided therefor.

As may be observed in Fig. 3, the rod 7 adjacent the upper end of the tubular frame 5 is provided with a slot 28. A lever 29 is pivotally mounted at 90 in the block 26 and extends through a way or slot 99 rovided in the block 26 and the slot- 28 in t e rod 7 and is upwardly `bent as indicated at 30 in Fig. 3 and outwardly bent and provided at the -end with a pin 36 as will be understood from Fig. 1. At the en'd of the block 26 over which the bent end 30 of the lever extends is secured a dial plate 31..whichvhas an upwardly and outwardly bent lug 32 spaced from thevface of the plate as will be understood from Figs. 1 and 3 and :a pin 33 extends through the said lug 32 into'the base of the plate and through the return bent end 34 of the pointer of a pointer. member 35 as shown in Fig. 3. This return bent end 34, as will be understood from Fig. 1, extends at an" angle to the bod portion 35 of the pointer and is engaged y the pin 36 in the end 3() of the leverv 29. The length lof the body of the pointer is many times the length of this end 34 so that a slight movement of the lever 29 causes a considerably greater movement of the indicating end of the pointer. The upper end of the indicator plate has positioned thereon a line 37 preferablyA graduated and near one end is a zero mark! as Will be understood from Fig. 1. Normalvly the pointer 35 turns to the right 'from the position shown in Fig. 1 under influence of a spring 23S-attached to the pointer and tow. stationary part ofthe dial support.

The pointer is operated by' means of the screwI 40 extending longitudinally' intov the end of therod 7 and projecting, into the slot 28 through which the vlei'r 29 asses. Normally, when the shoes are p aced on the work, the end of this pin 40. is above the lever 29 some little distance and as the work is ground and the shoe `(i'enabled'to move downward under the inlue'nce'of` the spring 25. the rod 7 is moved downward in the tubular frame 5 eventually bringing the point of the screw 40-i`nto contact with the lever depressing the same andv moving the end 30 downward. ,The pin 36 engages over the end. 34 ot' the pointer member and on.downward movement of the lever 29 causes the pointer 35, to traverse the line 37 to the left of position shown in Fig. 1. It is to be noted that this lever comes into operation as the izo termined diameter and to cause cessation of operation of the grinding machine 4the-instant the pointer reaches the'zero indication Upon cessation of operation of the grinding machine, it is necessary to Withdraw the shoes from contact with the work. For this purpose I have provided on the rod 7 a collar 41 to which on opposite sides is attached a link 42 and 43 each of which is pivotally' connected with the. levers 44 on opposite sides of the frame member 5. These levers 4.4 are both pivotalLy supported at 45 on opposite sides of the frame and one of the levers, preferably that upon the right h'and side of the device as shown in Figs. 1 and 2, has a hand lever 46 extending outwardly toward the front ,of the machinein position readily accessible by the operator and, by moving this lever upward in the direction shown by the. arrow in Fig. 2, the rod 7 and the shoe 6 are moved upward withdrawing the shoe from engagement with the Work. This also permits the shoe V18 to drop away yfrom the work onv the lower. side. In fact the shoe G would continue to remaln on the work' 47 extending through the rod 14 with which lli) the shoe 18 is connected. The prin 47 normally is above the end 13 of the supporting rod 8. This pin limits the-distance which the shoe 18may drop and, after the shoe '18 drops its permitted distance, 'the shoe 6 is thereupon drawn upward to the full'extent by the lever 46. The calipers are thus opened tov an extent suilicient `to permit rei moval of the finished piece and introduction of a new piece of ywork. The shoes 6l and 18 may be held in open Aosition after a new piece ot' work'has been introduced and need not be brought into engagement -with the work until it is approaching its desired size whereupon, by bringing the vlever 46 back to the position'shown in Fig. 2,- the shoes are again brought'into-contact with opposite sides of the work. As soon as the pin 36 comes into contact with the end 34jof the pointer, continued reduction of the diameter of the work will causethe pointer 35 to traverse the indicator. j -v i The caliper frame 5 and head 4 thereof are supported directl oiitheivertical rod 14 and may loe adjusted 1n position vertically of the said rod by means yof the splitbearing 20 "accuracy of the device.

to .vary the spacing of the shoes 6 and 18. The rod is slidable in the bearing 13 and this rod 14 at the end 17 thereof carries the lower shoe18, the upper shoe being carried o n the rod 7 vertically movable in the frame or casing 5 of the head 4. By thus rigidly securing the frame 5 and head 4 on the rod 14, which rod is vertically movable in the bearing 13 and with the spring 25 tending to force the shoe 6 downward, lthe shoes and supporting frame may loat.uith the work.

It is to be noted that the screw 40. is adjustable in the rod 7 so that the machine on being first set up to do a particular piece of work may be set accurately by Vgauging the work by the usual method of use of a hand caliper to secure a very accurate reading and the screw 40 accurately set. Thereafter, in the continued operation upon` the different pieces of the same character no further adjustment is required except to take upl wear for which purpose the work should occasionally be calipered by hand to verify the 'cured a great saving of time in the cost of production especially where a great number oft' pieces of the same character require the same general grinding operation. The individual pieces are set into the grinding machine, the machine operated until the' vpointer indicates zero whereupan the iinished part is removed as hereinbefore described and a new part introduced and partially ground and the calipers then set to ride the work during the l'remaining grinding ,operation I. have indicated this apparatus as being carried on a part 11 of the framework which moves with the grinding wheelso'that the caliper members 6 and 18 are riding the sur-l face of the work contacted by the grinding Wheel. Excellent result-s are secured where the grinding Wheel is moved longitudinally of the work as the lnicrometer or caliper is carried with the grinding wheel. Also, in

case the work is moved across the face of the grinding ywheel parallel with its axis'of rotation the device is equally etiicient in operation to permit the work to be calipered is avoided and, if the operator is observant ofthe indicator', all pieces may be finished to an exact size avoiding waste causedby over or under-sized parts. Preferably I provide an adjustable stop devicep150 on the upper end of the shaft or rod 8 which limits the extent to which the caliper frame may be turned in one direction about the axis of the rod 8. This stop enables the .shoesto be positioned correctly relative to the axis of the work. The device is also comparatively simple in construction and is of a character adapted to be attached to grinding machines of various types and when at- There is thus selll) eration. By the use of this device therefore tached to any of the ordinary inding machines now on the market ma es the machine practically automatic in operation.4

- Having thus full described my invention, what I claim and esire to secure by Letters Patent ofthe United States isthereon and a zero indication, a pointer adapted to traverse the graduated line, and means for moving the pointer operable through movement` of the said two parts toward each other. n

2. In an indicating micrometer adapted for use ona piece of work being reduced in diameter, a shoe vriding on the surface of the work, said shoe having an arcuate face the radius of which ispractically that of the finished work, yieldable means for causing movement thereof of the shoe in a straight line passing through the center of-rotation `oftheI work while .being reduced in diameter, an indicator havin a graduated line thereon and a zerov 1n ication, a pointer adapted totraverse'the said line, ajspring' tending to move the-pointer away fromthe zero indication, and means controlled by movement ofthe shoe through reduction in the diameter of the work causing the pointer to move toward the zero indication.

3. An indicating micrometer-for gauging the diameter of a piece of work during the time it is being reduced'in diameter com.- prising a pair of shoes adapted to engage .diametrically opposite .sides of `the workv during its reduction in diameter, yieldable.

means continuously holdin the shoes in engagement with the Work' uring itsreduction of diameter, means for maintaining the A.shoes in contact with diametrically opposite sides of the workduringthe reduced 'operation, anindicatorhaving a graduated line thereon including a zero-s point, a vspring tending to move the pointer away from the zero point, and means operated by movelment of the shoes toward each other for causing the pointer to move toward the zero indication.

- 4. In an indicating instrument adapted to' -measure'a ,piece of work while being reduced in diameter, means for contacting the work at tato diametrically opposite points, 'a

spring for moving the lshoes toward each other on a/straight line passing through the axis of the work, an indicator having graduations including a'zero point and aipointer member. adjustable relative to said :zero l point, and means for moving the indicator ,towards and away from the zero point in fixed relation to the increased or decreased distance between'the points contacted.

5. An indicating micrometer for. indicaproach each other, an indicator having a zero indication, a pointer for the indicator, and means whereby movement of both shoes permittedv by the reduction in diameter of the ,Work causes movement of the pointer across the indicator toward the Zero indication.

6. An indicating micrometer for use with grinding machines comprising in combina- 'tioii with the grinding wheel, ofI a caliperiiig device having partsl continuously riding in yieldable contact with diametrically opposite (sides ofthe work, Ja frame member supporting the calipering parts, said frame being rigidly attached relative to the grinding wheel frame and the said parts being positioned on the surface of the work running in contact with the grinding wheel, an indicatorhaving a graduated line and zero indication, a pointer adapt/'edito traverse the line, and means actuated through movement of the caliper parts toward each other causing the pointer to" move toward the zero indication.

7 An indicating micrometerfor use withv grinding machines comprising the combination with a grinding wheel, of a caliper device' having parts riding in yieldablc contact with diametrically opposite sides of the work, a rigid supporting frame, a movable frame having one of the said caliper parts attached thereto, the other of said caliper parts being movable lin the frame member, a spring tendiii to mve the said caliper member, an in icator rigidly attached to the sa'id vmovable frame, theindicat or having a line thereon and. a zero indication, a pointer pivotally mounted on the indicator adapted to traverse the said line,

a spring holding the pointerto one side of the zero mark, and means adapted on movement of the caliper parts'toward each-.other during the reduction in diameter of the work to move the pointer toward the zero indication. v

8. An indicatingv micrometer for use with grinding machines comprising the combination with the grinding wheel thereof, of a caliper device having paits riding in contact with ldiametrically yopposite sides of -the work, a rigidly supported frame, aframe movable relative thereto carrying the caliper parts, one ofV the caliper parts being attachd lmovable frame, a spring tending to project the said part and holding both caliper parts in yieldable contact with the work, and an indicating device having a zero indication and giving a visible indication of the extent of the surface of the work removed in the grinding operation.

9. An indicating micrometer for use with grinding machines, comprising the combi,- nation with the grinding wheel thereof, of a caliper device having parts riding in contact with diametrically opposite 'sides of the work, a frame supporting the caliper devices, a spring tending to move the two caliper parts together,v a rigid framework for the saidcaliper frame, the lsaid caliper frame being movable-inthe rigid frame permitting the caliper parts to oat on the work, an indicating device includ-ing a zero mark, and a pointer movable thereon: as j the caliper parts approach each other, the zero point indicating when the caliper parts have attained a predetermined distance apart.

10. 'An indicating micrometer for use with grinding machines comprising the combina-- tion with a grinding wheel, of a frame adapted to be rigidly supported relative to the wheel and capable of a vertical adjustment,

a second frame adjustable relative to qthe first frame and fixed thereto, a caliper frame movable relative .to the second frame carry- -ino' caliper parts adapted to engage opposite si es of the work, a spring tending to draw the caliper parts together, anindicator giving an indication of the movement bf the parts toward each other, the, said caliper parts and frame member v being supported directly in front of the grinding wheel, the said ir'st frame including a rod and a bracket clamping .the said rod permitting the second frame and caliper frame to be turned to swing the caliper parts to one side of the Wheel face, a stop member on a stationary bpart of the said rigidly supported frame,

and an adjustable device including apartadapted to engage the stop when the parts are turned tov operative position. Y,

11. .In an indicating micrometer for vuse with grinding machines, the combination withl a grinding wheel, of a frame member movable with the grinding wheel longitudinally of the work, said member having a part mounted to turn about a vertical axis,

- a pair of caliper parts carried by thefraine member adapted -to ride in contact with diametrically opposite sides of the work, means yieldablt(1 holding the caliper parts in contact 'Wi the Work, an indicator giving an `indication of the' extent of reduction of the diameter/of the work by the grindin wheel, an adjustable element on the turna le partv of the frame and a fixed elementi on the frame engaged thereby to limit the moveposition to engage the work.

12. An indicating micrometer for use with grinding machines comprising'the combinationwith a grinding Wheel, of a frame member pivotally mounted to the frame of the grinding Wheel at one side thereof, a caliper device comprisinga frame provided with calipering parts fbr engaging the work, the frame and caliper parts being adapted to', float in the pivotally mounted frame -with the said parts directly forward of the grinding wheel face, the pivot-al mounting of the nframe permitting the caliper (frame and parts to beturned away from the face of the wheel, an adjustable stop device'adapted to be set to limit the turning of the caliper members in one direction and accurately positionthe same relative to the Work whereby the said caliper parts are automatically positioned when turned to operative relation Withthe work.

-l3.` An indicating micrometer for use with grinding machines comprising the combina- "0 tion with the grinding wheel, of a frame, a rod adapted to be releasably held in rigid relationship with the frame, saidrod being adapted for vertical adjust-ment, aframe member detachably connected with the rod and adapted to bevertically adjusted thereon, a caliper frame supporting a pair of caliper parts, a spring tending to draw the points toward each other, the caliper 'frame and parts being freely movable'vertically in the said frame member whereby the said parts may float on the work, means for setting the points to engage work of various diameters, and an indicator actuated by movement of the caliper parts giving a visible 'indication of the extent of movement of the caliper parts toward each other when in engagement with Jthe work. 14. In an indicating micrometer, a caliper member, or shoe adapted to ride on the work, a rod connected therewith, a spring tending to move the roda frame on which the rod is movable, an indicator plate on the frame having a zero indicaticn, a pointer member therefor, a lever ivotedl to the frame and adapted to move t e pointer, and adjustable means on the rod adapted to engage the lever 4 llU and turn the pointer as the caliperV member ISU llo

mark, and means for adjusting the indicator actuating device to compensate for wear of the caliper parts.

16. An indicating micrometer for use wlth grinding machines comprising the combina being movably mounted relative thereto, a

spring supported in the frame and tending to move the movable shoe, the spring acting against the frame in one direction and against the shoe in opposite direction Whereby the caliper parts are yieldably drawn t`ogether, `an indicator member attached to the frame, a pointer movable thereover, and actuating means for the pointer operated by the movablesshoe. A

17. In an indicating instrument adapted to measure a iece of rotating work, measuring means inc uding a contact member yieldably held in engagement with the surface of the work and mounted to move on a straight line passing through the axis of *rotation of the work, an indicating pointer member associaed with the measuring means adjustable relative to a zeropoint, said indicating pointerl having movement towards or away from the zero -point in fixed proportion to the movement of the contact member toward or from the axis of the rotating work.

18. In anindicating instrument, in combination witlra machine having means for reducing. the diameter of material said means being .movable longitudinally o the axis of the material to nniformly reduce the diameter thereoffrom endto end, measuring means movablein fixed relation with the diameter reducing means durin its operation, said measuring means inclu 'Y aimember contacting the .materiahgan indicator having a zero indication, a movable pointer associated therewith, and means interposed between the contacting member. and the movable pointer to move thepointer toward the zero indication in fixed proportion to the reduction of the diameter of the material.

19. In an indicating instrument in combiyis reduced in diameter, means for holding said contact members on thesaid diametrical line duringthe reducing operation and a pointer actuated through movement of the 'said members by the spring.

21. In an indicating instrument in combination with a machine having means for reducing the thickness of a piece of material,

-a pair of shoescontacting opposite sides of the work, a framein which the shoes are supported, an indicatorassociated with the shoes, means for supporting the shoes relative to the frame tol move therein as a unit and to be moved relatively on a straight line passing through the work to be measured, means whereby reduction in the thickness of the material causes a change in the relative position of the shoes, and Ameans whereby such change in relative position actuates the indicator. l

22. In an indicating instrument in combination with means for reducing the diameter of a piece of rotating work, a pair of shoes adapted to contact diametrically opposite sides of the work and being movabletoward or from each other onl a straight linepassing through the axis lof rota-tion of the work a lever for moving the shoes away from the work, and an indicator caused to indicate the extent of reduction of. the diameter of the work by movement of the shoes toward each a'pair of shoes carried thereby, means for' causing the shoes to contact .diametrically opposite sides of the work, means for moving the shoes away from or toward each other on a straight line passing through the' axis of the rotation of the work, yieldable means to cause the shoes to approach each other as the diameter of the work is reduced, and

an indicator connectedwith the shoes-and movable thereby as the shoes approach each other to indicatethe extent of reduction of ,the diameterof the work.

[In testimony whereof, I sign this s'peciication.

PHILIP s. ARNOLD.' 

